The ant genus Odontomachus Latreille is reviewed for Sumatra, the sixth largest island in the world and located in western Indonesia. Previously three species were recorded from the island: O. simillimus F. Smith, O. rixosus F. Smith, and O. latidens Mayr. We add two species to the fauna, O. procerus Emery stat. nov and Odontomachus minangkabau sp. nov. The new species belongs to O. rixosus species group, and it is morphologically most similar to O. rixosus and O. pararixosus Terayama & Ito. However, it can be separated from the latter two by its large body (HL 3.13-3.55 mm, WL 4.15-4.65 mm), the masticatory margin with 11-14 denticles, and dark-colored body. Odontomachus latidens subsp. sumatranus Emery is newly synonymized with O. procerus. The castes and sexes of the known species are also described, including the first descriptions of the male for O. latidens, O. procerus, and O. rixosus. A key to the Sumatran species based on the worker caste is provided, and the bionomics of each species is summarized.

Two new species of the ant genus Myrmecina Curtis, 1829 are described and illustrated based on the worker and queen castes collected in Sumatra, Indonesia under the names M. andalas sp. nov. and M. nitidiuscula sp. nov. Each species displays unique morphological characteristics. Myrmecina andalas sp. nov. is characterized by a combination of the following characteristics: head dorsally sculptured, with the ventrolateral area smooth and shiny; propodeal spine short, triangular, pointing dorsad and with a broad base; propodeal declivity vertical, with the posterodorsal angle almost 90°. Myrmecina nitidiuscula sp. nov. is characterized by a combination of the following characteristics: head dorsum largely smooth and shiny; propodeal spine triangular and pointing posteriad, with a very broad base. Updated key to Myrmecina species of Sumatra is given.

A study about ant species composition in a highland of agricultural areas at Alahan Panjang Village, Solok District, West Sumatra Province was conducted in 2016 by using modified of quads protocol methods. A total of 18 ant species belonging to four subfamilies, eight tribes and 15 genera was collected. Myrmicinae was the highest in species number (eight species) followed by Formicinae (five species), Dolichoderinae (three species) and Ponerinae (two species). All ant species were different between two plantations except Monomorium florica (Jerdon, 1851) which was collected for both. Carebara cf. pygmaeus Emery, 1887 was the highest in the number of individuals which was found at Wheat site. Six functional group of ants were detected from all species collected.

Some pristine habitat in the region of west Sumatera is less-explored due to low number of herpetologists in the area. However, many species were described as new to science based on morphological or molecular approaches. We conducted preliminary study to uncover the diversity of amphibians and reptiles in mount Sago, Sumatera Barat. In this study, we surveyed the amphibian and reptiles in the dry season. We performed a visual encounter survey along the hiking trails to the mount peak. A group of 3 persons searched systematically in the potential habitat. We stop at two points where these were located close to the stream to focus the searching at the potential habitat. A small collection was made comprised 25 individuals of 7 families and 15 species. At lower altitude (1000 meter above sea level/m.a.s.l), we found Chalcorana calconota, Fejervarya cancrivora, Odorrana hossii, Phrynoidis aspera, Microhyla heymonsi, Polypedates leucomystax, Megophrys nasuta, Limnonectes kuhlii, L. macrodon. At higher altitude (2567) masl), we collected Philautus polymorphus, Leptophryne borbonica, Leptobrachium hasseltii, and the juvenile of Broncochela hayeki. The limited finding to amphibians and reptiles were caused by the time of survey which was conducted in the dry season. Amphibians and reptiles less-active during dry season to prevent the loss of excessive water.

The study of nocturnal insect diversity was conducted in Bukik Kasang, Padang Pariaman District, West Sumatra from April to May 2019. The pitfall trap was used to collect the active insect on the ground in three different habitats: open area, edge of plantation, and inside the plantation. A total 10 orders, 44 morphospecies, and 180 individual of nocturnal insect was collected. The Order Hymenoptera was the highest in number of morphospecies and individual, and in other hand, the Order Hemiptera was the lowest one. This study is very important to reveal the diversity of insect in Bukik Kasang, due to the increasing of human activities in this area and planning to develope this area as tourist destination.